III. Переведите их на русский язык, обращая внимание на разные значения глаголов to be, to have, to do. ⦁ Man had to learn to obtain electric power directly from the Sun.
⦁ The task of our scientists is to use atomic energy for peaceful purposes.
⦁ The coefficient of thermal conductivity of gases does not depend on the pressure.
⦁ The caloric theory of heat had existed up to the middle of the 19th century.
⦁ Weight is the force with which a body is attracted by the Earth.

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